Improve class coverage

src/test/groovy/net/fortuna/ical4j/filter/DateInRangeRuleTest.groovy

@@ -0,0 +1,27 @@
+package net.fortuna.ical4j.filter
+
+import net.fortuna.ical4j.model.DateRange
+import spock.lang.Shared
+import spock.lang.Specification
+
+class DateInRangeRuleTest extends Specification {
+
+    @Shared def rangeFrom = Calendar.instance
+    @Shared def rangeTo = Calendar.instance
+
+    def setupSpec() {
+        rangeTo.add(Calendar.DAY_OF_MONTH, 7)
+    }
+
+    def 'assert rule match'() {
+        given: 'a date range rule'
+        DateInRangeRule rule = [range, DateRange.INCLUSIVE_START | DateRange.INCLUSIVE_END]
+
+        expect:
+        rule.test(date) == test
+
+        where:
+        range                                                 | date       | test
+        new DateRange(rangeFrom.getTime(), rangeTo.getTime()) | new Date() | true
+    }
+}